Across
1
Unit of power
2
Nerve cell in the brain
4
Blocking of light by a celestial body
8
Hottest planet in solar system
9
Ball of burning gas in space
10
Molten rock beneath Earth surface
Down
1
Disturbance that transfers energy
2
Unit of force
3
Form of thermal energy
5
Unit of electric potential
6
Curved glass that refracts light
7
Biological catalyst